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Sp 15- Fixed Restorative Final > CVC Preparation > Flashcards

CVC Preparation Flashcards

1
Q

What is the convergence angle?

A

The angle or taper formed by diametrically opposed axial walls

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2
Q

What is retention form?

A

The characteristics of a tooth preparation that resist REMOVAL of a restoration along its POW

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3
Q

What is resistance form?

A

The characteristics of a tooth preparation that PREVENT DISLODGEMENT of a seated restoration by forces directed apical or oblique and prevents dislodgement by occlusal forces

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4
Q

What is the difference between resistance and retention form?

A

Resistance form: prevents dislodgment apical, oblique, occlusal
Retention form: resists removal along the POW

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5
Q

Which of the following is NOT an advantage of Complete Veneer Crowns?

  1. High Strength
  2. Longevity
  3. High resistance to displacement
  4. Margins close to gingiva
A
  1. Margins close to gingive = perio issues
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6
Q

The inability to test for ________ is a disadvantage of CVC preparation.

A

Pulp Vitality

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7
Q

Extensive destruction by caries, endodontically treated teeth, large existing restorations, and maximum retention needed are all ________ for CVC.

A

indications

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8
Q

True or False: Recontouring of axial surfaces and correcting malinclination are two indications for CVC.

A

True

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9
Q

What is a CONTRAindication for complete veneer crowns?

A

When a tooth can be restored with a more conservative restoration.

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10
Q

What are the three considerations/principles of tooth preparation?

A
  1. Biological: health of oral tissue
  2. Mechanical: integrity and durability of restoration
  3. Esthetic: appearance of the patient
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11
Q

________ form takes into account the magnitude and the direction of dislodging forces.

A

Resistance

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12
Q

To prevent deformation of the restoration, you need proper ______ selection, adequate tooth ________, and correct _______ design.

A

Alloy
Reduction
Margin

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13
Q

“A cast-gold extracoronal restoration which covers the clinical crown” is a definition of what type of crown?

A

CVC

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14
Q

“Extensive coronal destruction” would be a(n) ________ for a CVC.

A

indication

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15
Q

“An intact buccal or lingual wall” would be a(n) _________ for a CVC.

A

contraindication

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16
Q

“Maximum retention and resistance needed” would be a(n) ________ for CVC.

A

indication

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17
Q

“Endodontically treated tooth” would be a(n) ________ for a CVC.

A

indication

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18
Q

“Short clinical crown” would be a(n) ________ for a CVC.

A

indication

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19
Q

A complete cast crown allows the operator to modify _______ as well as ________.

A

Axial tooth contour

Occlusal discrepencies

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20
Q

What are the four disadvantages to using a CVC crown preparation?

A
  1. Removal of large amounts of tooth structure
  2. Adverse effect on tissue
  3. Display of metal
  4. Vitality testing not feasable
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21
Q

What is the “finish line”?

A

The terminal portion of the prepared tooth

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22
Q

What is a chamfer?

A

a finish line design for CVC tooth preparation in which the gingival aspect meets the external axial surface at an OBTUSE angle

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23
Q

What is “convergence angle”?

A

The taper of a crown preparation between opposing axial walls, measured in degrees

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24
Q

The long axis of the tooth is determined clinically by bisecting the angle between opposing axial surfaces in the _______ third of the tooth.

A

gingival

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25
Q

_______ is defined as the convergence of two opposing external walls of a tooth preparation. The extension of those planes will form the “angle of convergence”

A

Taper
*for CVC: there should be a 3 degree taper on each axial wall, resulting in an “angle of convergence” equal to 6 degrees

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26
Q

List the six steps in a CVC preparation:

A
  1. occlusal guide grooves
  2. occlusal reduction
  3. axial guide grooves
  4. buccal/lingual axial reduction
  5. interproximal axial reduction
  6. finishing and evaluating
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27
Q 
What are the dimensions for proper CVC preparation?
Central Groove
Functional Cusp
Non-functional Cusp
Chamfer Width
A
  1. 0mm
  2. 5mm
  3. 0mm
  4. 5mm
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28
Q

Occlusal guide grooves should be placed with a _______ ________ bur in ______speed handpiece.

A

242.6 diamond

high

29
Q

Depth grooves should be placed _____mm shallower than intended tooth reduction in order to allow for smoothing.

A

0.2mm

30
Q

What is the width at the tip of the 242.6 diamond bur compared to the most proximal portion?

A

Distal (tip) = 0.8mm

Proximal = 1.3mm

31
Q

Because the width of the proximal end of the 242.6 diamond bur is _______mm, the bur should only be buried completely on which part of the reduction?

A

1.3mm

Functional cusp and Functional cusp bevel

32
Q

Occlusal guide grooves should be placed at the height of each _______ ridge, in the _______ and ______ grooves, and in the fossae grooves.

A

Triangular

buccal and lingual

33
Q

The functional cusp bevel should be placed at what angle?

A

45 degrees to the long axis of the tooth

34
Q

What is the purpose of the functional cusp bevel?

A

Ensures that correct contours of the final restoration can be re-established while providing adequate thickness of material on the functional cusp.

35
Q

The final depth of the functional cusp bevel will be ______mm even though the initial guide grooves were placed ______mm deep to the unprepared surface.

A
  1. 8

1. 3 (buried the bur when placing functional cusp bevel grooves)

36
Q

In order to check for “occlusal clearance” clinically, you will use a _________ gauge which has two ends measuring 1.0mm and 1.5mm.

A

Ball-Gauge

37
Q

What does “conservation of tooth structure” mean for preparing a tooth for a CVC?

A

Minimum tooth reduction compatible with adequate strength and correct contours of the restoration

38
Q

Moving a 242.6 diamond bur parallel to the long axis of the tooth will create a tapered surface that converges _____ degrees from the cervical toward the occlusal.

A

3 or 4 degrees

39
Q

______ axial guide grooves should be placed in the buccal and lingual walls of the tooth.

A

Three

  • center
  • One at each mesial and distal line angle
40
Q

The ______ of the diamond must be held parallel to the proposed path of withdrawal.

A

Shank

41
Q

The chamfer should be _____mm wide and ____mm from the gingiva.

A
  1. 5

0. 5

42
Q

Which part of the restoration is a potential site of failure due to cement dissolution or roughness?

A

The gingival margin

43
Q

Axial walls should be extended interproximally until just short of _____ and then you should switch to a ___ _____ bur.

A

contact

169 L carbide

44
Q

Interproximally, which three burs should be used?

A

169 L carbide

  1. 6M diamond
  2. 6M diamond
45
Q

What three characteristics of preparation design would cause inadequate retention and resistance?

A
  1. excessive convergence angle (greater than 10 degrees)
  2. inadequate height of axial walls
  3. insufficient surface area to resist tipping
46
Q

A wide margin, deviation from POW or tooth anatomy, and excessive convergence angle would result in _____.

A

Excess reduction ….less stability

47
Q

True or False: A polished surface is unacceptable when preparing for a CVC.

A

True: there should be slight striations from the diamond burs

48
Q

The final reduction at the central groove should be ____.

A

1.0mm

49
Q

The final reduction on the functional cusp should be _____.

A

1.5mm

50
Q

The interproximal chamfer should be placed with _____mm clearance.

A

0.5

51
Q

The margin should be placed _____mm above the gingiva or _____mm coronal to the CEJ.

A
  1. 5

1. 0

52
Q

Inadequate marginal integrity will occur if the chamfer is too _____ to provide correct amount of material or too _____ to allow proper adaptation.

A

narrow

rough

53
Q

An undercut will cause distortion of the _____ pattern.

A

Wax

54
Q

List the seven steps in a CVC preparation:

A
  1. occlusal guide grooves
  2. occlusal reduction
  3. Functional cusp bevel
  4. axial guide grooves
  5. buccal/lingual axial reduction
  6. interproximal axial reduction
  7. finishing and evaluating
55
Q

What is a “long chamfer”?

A

One that starts too far coronal and then slopes down to the proper finish line (0.5 mm above gingiva).

56
Q

The tips of the 242.6M and 747.6M diamond burs are ______ in order to produce a chamfer.

A

hemispherical

57
Q

The path of withdrawal should be ______ degrees from the long axis.

A

+/- 5 degrees

58
Q

The POW has a _____ inclination for mandibular molars.

A

lingual

59
Q

Occlusal reduction should be done in a _____ orientation.

A

planar

60
Q

Maxillary CVC preparations differ in that they require a ______ and a POW that is ______.

A 
2nd plane reduction
slightly buccal (functional cusp is lingual)
61
Q

For maxillary CVC preparations there is a ______ second plane reduction that allows uniform reduction of 1.0mm.

A

Buccal

62
Q

The buccal second plane of reduction for maxillary teeth should be placed according to what?

A

The previously unprepared angulation at the buccal surface.

*check angulation to adjacent teeth in the occlusal third of the buccal walls

63
Q

The buccal first plane is from the gingival crest up to the junction of the ______ and _____ third of the tooth.

A

middle and occlusal

64
Q

The buccal second plane of maxillary teeth is from the junction of the ______ and _____ third of the tooth up to the occlusal edge.

A

middle and occlusal

65
Q

For maxillary CVC preparation, the lingual cusp reduction should be _____ and the linguo-occlusal line angle reduction should be ______.

A
  1. 5mm

0. 8mm

66
Q

True or False: The second plane of reduction for maxillary CVC preparations should be carried interproximally.

A

False: taking the 2nd plane interproximally would overconverge the occlusal 1/3 of the mesial and distal axial walls.

67
Q

Using a silicone mold, you should evaluate the ________ line angle of a mandibular preparation to determine the need for a non-functional cusp bevel.

A

linguo-occlusal

*Must be a MINIMUM of 0.6mm (ideal =0.8mm)

68
Q

For a maxillary CVC preparation, the buccal second plane reduction should measure _____.

A

1.0mm

Sp 15- Fixed Restorative Final (10 decks)

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